L6983 38 V Step-Down Converter is a synchronous monolithic step-down regulator

L6983 38 V Step-Down Converter is a synchronous monolithic step-down regulator

STMicroelectronics’ step-down converter is an easy to use synchronous monolithic step-down regulator

STMicroelectronics L6983 Synchronous Step-Down Converter is an easy to use monolithic step-down regulator capable of delivering up to 3A DC to the load. The wide input voltage range makes the device suitable for a broad range of applications. The L6983 is based on a peak current mode architecture. The device is packaged in a QFN16 3×3 with internal compensation, thus minimizing design complexity and size.

The L6983 is available both in low consumption mode (LCM) and low noise mode (LNM) versions. LCM maximizes the efficiency at light-load with controlled output voltage ripple so the device is suitable for battery-powered applications. LNM makes the switching frequency constant and minimizes the output voltage ripple for light load operations, meeting the specification for low noise-sensitive applications. The L6983 allows the switching frequency to be selected in the 200kHz to 2.2MHz range with an optional spread spectrum for improved EMC.

The EN pin provides an enable/disable function. The typical shutdown current is 2µA when disabled. As soon as the EN pin is pulled up, the device is enabled, and the internal 1.3ms soft-start takes place. The L6983 features Power Good open collector that monitors the FB voltage. Pulse-by-pulse current sensing on both power elements implements an effective constant current protection, and thermal shutdown prevents thermal run-away.


  • Two different versions: LCM for high efficiency at light loads and LNM for noise-sensitive applications
  • 200 kHz to 2.2 MHz programmable switching frequency; stable with low-ESR capacitors
  • Operating input voltage: 3.5 V to 38 V
  • Output voltage: 0.85 V to VIN
  • 3 ADC output current
  • Operating quiescent current: 17 μA
  • 2 μA shutdown current
  • Optional spread spectrum for improved EMC


  • Designed for 24 V buses industrial power systems
  • 24 V battery-powered equipment
  • Decentralized intelligent nodes
  • Sensors and always-on applications

Block Diagram:

more information: www.st.com
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Mike is the founder and editor of Electronics-Lab.com, an electronics engineering community/news and project sharing platform. He studied Electronics and Physics and enjoys everything that has moving electrons and fun. His interests lying on solar cells, microcontrollers and switchmode power supplies. Feel free to reach him for feedback, random tips or just to say hello :-)

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